A 22-year-old male patient was admitted to the emergency room after falling on the left arm while playing football. On the examination, he has severe pain on the left arm and restricted to bring abduction. An anti-inflammatory analgesic drug was administered intramuscularly to the patient whose vital signs were stable at the time of admission. Then, the patient had a two-sided AP shoulder graphy. On the graphy, type III acromioclavicular joint (ACJ) dislocation was detected according to Rockwood classification on the left shoulder (Figure 1a,b). The patient was consulted in the orthopedics department. The patient had a shoulder tomography (Figure 2) and admitted to the orthopedic clinic. Surgical operation was performed by the orthopedic clinic (Figure 3). The patient was discharged without any problem after the operation.

We wanted to present a case of ACJ separation assessed as type III in the emergency department patient with shoulder motion restriction and severe pain. ACJ separation is a rare diagnosis in patients presenting with emergency services with limited shoulder movement and severe pain. The ACJ separation is an injury that accounts for approximately 12% of shoulder injuries in all populations. This rate can reach up to 50% in athletes (1). According to the Rockwood classification, there are six types of ACJ injuries. Type I, II, III is more common and, type IV, V, VI is more rare. Type III ACJ injury is described as torning of the acromioclavicular and coracoclavicular ligaments with a pronounced elevation of the distal clavicle (25-100% widening at the coracoclavicular distance). While types I and II are typically treated conservatively, types IV and VI are often surgically treated. The management of type III injuries is still controversial (1-3). In type III AC injuries, the choice of treatment depends on the decision of the surgeon and the patient. Some studies prefer surgery to obtain anatomically of the shoulder good functioning in physically active young adults. Thus, chronic instability and pain will also be reduced (2-4). Some researchers prefer conservative treatment especially in elderly patients due to low complication rate and duration of healing (2-5). In conclusion, most studies found no significant difference in outcomes between the operated and nonoperated groups (2,3).

It is important to remember the ACJ injuries in the emergency department with severe pain in the shoulder. The patient can face cosmetic and disability consequences when such injuries are overcome. For this reason, correct classification of the injury is important and bilateral comparative radiographies may be necessary.